Operations Menu
MS-610 Scanner User’s Manual
2-13
2–Menu C
on
fig.
Figure 2-4 External Level Trigger Signals
Figure 2-5 External Edge Trigger Signals
a.
Level
and
Edge
apply to the active logic state (positive or negative) that
exists while the object is in a read cycle, between the rising edge and falling
edge.
Rising edge
is the trigger signal associated with the appearance of an
object.
Falling edge
is the trigger signal associated with the subsequent dis-
appearance of the object.
Second trigger
1
The same object, moving out of the
detector's beam, causes a second
trigger (falling edge trigger) signal to
be sent to the scanner ending the
read cycle.
First trigger
An object, moving in front of the
detector beam, causes the first trigger
(rising edge trigger) signal to be sent to
the scanner initiating the read cycle.
Object
detector
1
Object
detector
S ub seq uen t rising edg e trig ger
O bject #2, m o vin g in front of th e d etecto r's
beam , c au ses a seco nd trigg er (rising
edg e trigg er) sign al to b e sen t to th e
scanner.
T h is sig n al initiates a n ew read c yc le
and
end s th e previo us rea d cycle pro vided that
N ew Trigger or Tim eou t a nd N ew Trigger
is en abled and a go od read o r tim eo ut h as
not already oc cu rred.
2
1
First rising ed ge trig ger
O bject #1, m o vin g in fron t o f th e d etecto r’s
beam , c au ses the first trigger (risin g edg e
trigg er) sign al to b e sen t to th e scanner,
in itiating th e read cycle.
O bject
detector
O bject
detector
